CONSOLIDATED BALANCE SHEETS (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Assets
Fixed maturity investments, at fair value	$ 5,287.7	$ 5,786.1
Short-term investments, at amortized cost (which approximates fair value)	772.8	975.3
Common equity securities, at fair value	669.8	667.0
Convertible fixed maturity investments, at fair value	140.5	143.0
Other long-term investments	328.8	372.1
Total investments	7,199.6	7,943.5
Cash (restricted: $393.3 and $286.7)	557.7	395.0
Reinsurance recoverable on unpaid losses	2,581.2	2,344.0
Reinsurance recoverable on paid losses	30.9	63.1
Insurance and reinsurance premiums receivable	644.8	532.5
Funds held by ceding companies	131.6	118.7
Investments in unconsolidated affiliates	458.6	389.7
Deferred acquisition costs	202.9	176.1
Deferred tax asset	431.7	431.9
Ceded unearned insurance and reinsurance premiums	104.4	184.0
Accrued investment income	58.3	63.3
Accounts receivable on unsettled investment sales	20.3	39.5
Other assets	760.2	730.0
Assets held for sale	1,399.5	1,122.8
Total assets	14,581.7	14,534.1
Liabilities
Loss and loss adjustment expense reserves	5,882.0	5,736.8
Unearned insurance and reinsurance premiums	976.4	938.7
Debt	669.0	818.8
Deferred tax liability	360.6	373.2
Accrued incentive compensation	169.9	157.4
Ceded reinsurance payable	188.3	221.1
Funds held under reinsurance treaties	39.3	85.8
Accounts payable on unsettled investment purchases	57.1	22.3
Other liabilities	1,310.6	1,167.7
Liabilities held for sale	909.4	751.5
Total liabilities	10,562.6	10,273.3
White Mountains' common shareholders' equity
White Mountains' common shares at $1 par value per share - authorized 50,000,000 shares; issued and outstanding 7,630,717 and 8,194,925 shares	7.6	8.2
Paid-in surplus	1,262.7	1,350.8
Retained earnings	2,004.0	2,175.6
Accumulated other comprehensive income, after-tax:
Equity in unrealized gains from investments in unconsolidated affiliates	135.7	58.5
Net unrealized foreign currency translation gains	35.7	61.4
Other	(1.0)	(1.5)
Total White Mountains' common shareholders' equity	3,444.7	3,653.0
Noncontrolling interests
Noncontrolling interest - OneBeacon Ltd.	269.8	295.0
Noncontrolling interest - Sirius Group Preference Shares	250.0	250.0
Noncontrolling interest - consolidated limited partnerships and A.W.G Dewar	54.6	62.8
Total noncontrolling interests	574.4	607.8
Total equity	4,019.1	4,260.8
Total liabilities and equity	$ 14,581.7	$ 14,534.1